This is to avoid a fragmentation in target-setting and measurement approaches, which would slow down the widescale adoption of reuse. The World Economic Forum’s Consumers Beyond Waste (CBW) initiative has been convening a working group of leading consumer companies and non-profit organizations since early 2022 to build a seminal guide to standardized reuse measurement, with two priority metrics that in combination most robustly track progress on reuse.At the end of 2022, the Forum published a preliminary version of the guidelines with the priority metrics, parameters with inclusions and exclusions, and calculation examples. In 2023, these guidelines were piloted and select companies in the working group tested the metrics in real-world settings against their respective reuse activities. The measurement guidelines have been refined based on testing outcomes and working group contributions throughout the past year.